The French NGO/Association "Les Humains Associés" (The Associated Humans -
http://en.wikipedia.org/wiki/The_Associated_Humans) have developped a
special Netiquette Charter for their Île Verte island and Second Life.
It's a development and adaptation of their Nethic Charter for bloggers :
French version here :
As you can see, everything is on a Wiki, so that everyone is welcome to
participate and cooperate in the evolution of those Charters. ;-)